Great to have this app to play my old ROMs. I am using the AfterGlow AX1 x360 wired controller and it works great. The controller auto installed.
Here is a video tutorial for the app that shows how to get and where to get games to the app
http://www.youtube.com/watch?v=fxIq4s91IL8&feature=share&list=UUsvWLbRkI1QUDwuJR2sYV9g
Awesome! I've been dying to find a GBA emulator for my surface too, does anyone know if it exists? At the moment i'm having to run it off my pc and use remote connection to play it lol not the most elegant solution.